... it save60% water. induction quenching ,high frequency induction quenching furnace,high frequency induction machine.quenching the guide rail of machine ... surface,machine tool guideways,etc hardening.Hardening equipment:frequency about 40KHZ,smaller can hardening high precision small ... , axe5. hardening pin, piston ring, spring pin, valve, shifting fork.6. all kinds of track spiker.Hardening features:1 ...